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Power flow transfer control method for series-wound side transformer and bypass switch of UPFC (unified power flow controller)

A technology of bypass switch and power flow transfer, applied in the direction of AC network with the same frequency from different sources, can solve problems such as overcurrent, and achieve the effects of reducing current impact, smooth transfer, and smooth start and stop

Active Publication Date: 2016-08-24
XJ ELECTRIC +3
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Problems solved by technology

[0009] The purpose of the present invention is to provide a power flow transfer control method between the series side transformer of the unified power flow controller and its bypass switch, so as to solve the problem of overcurrent generated by the existing control method

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  • Power flow transfer control method for series-wound side transformer and bypass switch of UPFC (unified power flow controller)
  • Power flow transfer control method for series-wound side transformer and bypass switch of UPFC (unified power flow controller)
  • Power flow transfer control method for series-wound side transformer and bypass switch of UPFC (unified power flow controller)

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The invention provides a power flow transfer control method between the series-side transformer and the bypass switch of the unified power flow controller, which can realize the smooth transfer of the line power flow between the series-side transformer and the bypass switch, and can effectively suppress the connection and withdrawal of the series transformer. Bypass the overcurrent during the breaking process of the bypass switch to realize the smooth start and stop of the unified power flow controller.

[0033] figure 2 It is a schematic diagram of the UPFC control system of the two-phase stationary coordinate control system on which the present invention is based.

[0034] The steps of the power flow transfer control method are as follows:

[0035] A. According to the direction of the power flow transfer between the series transformer and the bypa...

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Abstract

The invention relates to a power flow transfer control method for a series-wound side transformer and a bypass switch of a UPFC (unified power flow controller). In a two-phase static coordinate system based control system, a control mode is switched into a valve side current singe inner loop control mode; and by setting a proper current reference value, the transfer of the line power flow between the series-wound side transformer and the bypass switch is realized. The control method provided by the invention can be applied to the starting and stopping processes of the UPFC with the two-phase static coordinate system based control system; through the smooth transfer control on the line power flow between the series-wound side transformer and the bypass switch, the in-service / out-of-service of the series-wound side transformer and the overcurrent of the bypass circuit in the on-off process can be effectively restrained, and the steady starting and stopping of the UPFC can be realized.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a power flow transfer control method between a series side transformer and a bypass switch of a unified power flow controller. Background technique [0002] With the rapid growth of my country's economy, the power system has also developed rapidly. The interconnection of various large-scale power systems and the use of new equipment have made the grid structure more and more complex, and the distribution of power flows between grids is uneven and difficult to control. , some lines have the risk of overload instability. [0003] Flexible Alternative Current Transmission Systems (FACTS) is a new AC transmission technology formed by integrating power electronics technology, communication technology and control technology, which can realize flexible control of the voltage, impedance and phase angle of the transmission system, thereby greatly improvin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 姚为正刘欣和吴金龙胡亮冯宇鹏李道洋杨美娟王先为
Owner XJ ELECTRIC
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